MICRO Relational Database Management System: Difference between revisions

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Implementation of MICRO began in 1970 as part of the Labor Market Information System (LMIS) project at the University of Michigan's Institute of Labor and Industrial Relations (ILIR). Dr. Malcolm S. Cohen was Director of the LMIS Project and was the principal innovator and designer of the original MICRO Retrieval System.<ref>[http://www.eric.ed.gov/ERICWebPortal/search/detailmini.jsp?_nfpb=true&_&ERICExtSearch_SearchValue_0=ED094719&ERICExtSearch_SearchType_0=no&accno=ED094719 ''Feasibility of a Labor Market Information System, Volume 3, Final Report for Period July 1, 1970-June 30, 1974''], Malcolm S. Cohen, Labor Market Information System (LMIS) Project, Institute of Labor and Industrial Relations, University of Michigan, June 1974, 76 pages, PDF</ref> Carol Easthope and Jack Guskin were the principal programmers. D.L. Childs, Vice President of Set Theoretic Information Systems (STIS) Corporation, provided continuing guidance in the use of the Set-Therotical Data Structure (STDS) model and software by MICRO. Funding came from the Office of Manpower Administration within the U.S. Department of Labor.<ref name=MICROManual1977/> MICRO was first used for the study of large social science data bases referred to as micro data; hence the name. Organizations such as the [[United States Department of Labor|US Department of Labor]], the [[United States Environmental Protection Agency|US Environmental Protection Agency]], and researchers from the [[University of Alberta]], the [[University of Michigan]], [[Wayne State University]], the [[University of Newcastle upon Tyne]], and [[Durham University]] used MICRO to manage very large scale databases until 1998.

MICRO runs under the [[Michigan Terminal System]] (MTS), the interactive time-sharing system developed at U-Mthe University of Michigan that runs on IBM [[360-67|SIBM System/360- Model 67]], [[SSystem/370]], and compatible mainframe computers.<ref>[http://babel.hathitrust.org/cgi/pt?view=image;size=100;id=mdp.39015014920717;page=root;seq=5 "Chapter 6: MICRO" in ''Introduction to database management systems on MTS''], Rick Rilio, User Guide Series, Computing Center, University of Michigan, March 1986, pages 147-189</ref> MICRO provides a query language, a database directory, and a data dictionary to create an interface between the user and the very efficient proprietary Set-Theoretic Data Structure (STDS) software developed by the Set-Theoretic Information Systems Corporation (STIS) of Ann Arbor, Michigan. The lower level routines from STIS treat the data bases as sets and perform set operations on them, e.g., union, intersection, restrictions, etc. Although the underlying STDS model is based on set theory, the MICRO user interface is similar to those subsequently used in [[relational database management systems]].<ref>[http://dx.doi.org/10.1145/362384.362685 "A Relational Model of Data for Large Shared Data Banks"], E.F. Codd, Communications of the ACM, volume 13, issue 6 (June 1970), pp. 77–387, doi= 10.1145/362384.362685</ref><ref name=North2010/> MICRO's data representation can be thought of as a matrix or table in which the rows represent different records or "cases", and the columns contain individual data items for each record; however, the actual data representation is in set-theoretic form. In labor market applications the rows typically represent job applicants or employees and columns represent fields such as age, sex, and income or type of industry, number of employees, and payroll.<ref name=Hershey1972/>

MICRO permits users with little programming experience to define, enter, interrogate, manipulate, and update collections of data in a relatively unstructured and unconstrained environment.<ref name=MICROManual1977/> An interactive system, MICRO is powerful in terms of the complexity of requests which can be made by users without prior programming language experience.<ref>"[http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2581360/pdf/procascamc00021-0314.pdf Use of a Relational Database to Support Clinical Research: Application in a Diabetes Program]", Diane Lomatch, M.P.H., Terry Truax, M.S., Peter Savage, M.D., Diabetes Center Unit, MDRTC, University of Michigan, 1981</ref> MICRO includes basic statistical computations such as mean, variance, frequency, median, etc. If more rigorous statistical analysis are desired, the data from a MICRO database can be exported to the Michigan Interactive Data Analysis System (MIDAS),<ref>[http://babel.hathitrust.org/cgi/pt?id=mdp.39015004498013;page=root;view=image;size=100;seq=3;num=i ''Documentation for MIDAS''], Daniel J. Fox and Kenneth E. Guire, Third Edition (September 1976), Statistical Research Laboratory, University of Michigan, 203 pp.</ref> a statistical analysis package available under the [[Michigan Terminal System]] (MTS).<ref>"[http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2245120/pdf/procascamc00019-0674.pdf Converting from Traditional File Structures to Database Management Systems: A Powerful Tool for Nursing Management"], Yvonne Marie Abdoo, Ph.D., R.N, Wayne State University College of Nursing, 1987</ref>

== References ==